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fs/cpio: make cpio rootfs reproducible

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Pass the recommended argument in the CPIO manual to make cpio archives
reproducible.

Reference: https://www.gnu.org/software/cpio/manual/cpio.html#Copy_002dpass-mode

Pre-patch diffoscope output: https://gitlab.com/snippets/1874745
Post-patch: https://gitlab.com/snippets/1874746

We can see that post-patch, the archive related differences are removed.
The differences are arising from utils/bin/getconf. This will have to
be investigated further. However, that is unrelated to cpio.

Signed-off-by: Atharva Lele <itsatharva@gmail.com>
Reviewed-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Atharva Lele 2019-07-16 23:05:18 +05:30 committed by Thomas Petazzoni
parent 48f2f4dd8e
commit fd544aaebb
1 changed files with 8 additions and 1 deletions
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9
fs/cpio/cpio.mk
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@ -29,8 +29,15 @@ endif # BR2_ROOTFS_DEVICE_CREATION_STATIC
ROOTFS_CPIO_PRE_GEN_HOOKS += ROOTFS_CPIO_ADD_INIT
# --repoducible option was introduced in cpio v2.12, which may not be
# available in some old distributions, so we build host-cpio
ifeq ($(BR2_REPRODUCIBLE),y)
ROOTFS_CPIO_DEPENDENCIES += host-cpio
ROOTFS_CPIO_OPTS += --reproducible
endif
define ROOTFS_CPIO_CMD
cd $(TARGET_DIR) && find . | cpio --quiet -o -H newc > $@
cd $(TARGET_DIR) && find . | cpio $(ROOTFS_CPIO_OPTS) --quiet -o -H newc > $@
endef
ifeq ($(BR2_TARGET_ROOTFS_CPIO_UIMAGE),y)